The Omron E2E2-X10MB2-M1 is an unshielded proximity sensor with a 10 mm sensing distance, PNP open-collector output configured normally closed, terminated with an M12 connector. This puts it in the workhorse range for detecting ferrous targets through non-metallic walls or where flush mounting isn't required.
How it compares to the 5 mm sibling
The closest functional peer is the E2E2-X5MB1-M1: same body, same PNP output, same M12 connector, but 5 mm sensing distance and normally open instead of normally closed. If your application calls for an NO output or a shorter range, that sibling works without rewiring the connector — identical footprint. If you need a fail-safe NC output or the extra 5 mm reach, the X10MB2-M1 is your pick.